The contents of issues 3 and 4 for the calendar year 2013 are summarized in the current review of the journal Structural Chemistry. A brief thermochemical commentary is added to the summary of each paper. Abbreviations AIM Atoms in molecules BNNT Boron nitride nanotube CNC Carbon nanocone CSD Crystal structure determination DFT Density functional theory DNB 1,5-Dinitrobiuret EDA Energy decomposition analysis HF Hartree-Fock GED Gas electron diffraction GIAO Gauge-independent atomic orbital HOMA Harmonic oscillator measure of aromaticity MD Molecular dynamics MP Møller-Plesset perturbation MP2Second-order Møller-Plesset perturbation NRT Natural resonance theory ONIOM Our own N-layered integrated molecular orbital and molecular mechanics QTAIM Quantum theory of atoms-in-molecules NAO Natural atomic orbital NBO Natural bond orbital PES Potential energy surface